[SOLVED] PIC16F877A Question - port reading from another port

[corpuralx]

Will it be possible for the ports to read the output of another ports?

Like for example, there's a connection between porta.f0 and portb.f0 and between those connections, there's a switch. So if the switch is toggled(ON), and send a data/value of 1 toporta.f0, the portb.f0 will then read the 1 value, but if the switch is off or not toggled, the portb.f0 will not be able to read the 1 value and instead, read it as 0.. is that possible? i've tried combinations of connections in proteus but to no avail. If switch is toggled, portb.f0 is not receiving a value of 1 and instead its just either blue or gray color in proteus which is i believe is 0. Sorry for my grammar, still a newbie as well in microc pic programming. Thanks in advance. Any simple circuit provided is appreciated. Thanks

 

[andre_luis]

Yes, it is perfectly feasible, and even too much usual, although on above example is not so usual.
This principle is commonly used on keypad scan routines.



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[corpuralx]

Is true that it might not work on the proteus but 100% work on actual/breadboarding? One of my friends told me that it's possible, that the proteus needs "buffer" but on breadboard is not needed. I don't know whats buffer. Can anyone provide liek a simple circuit how would that work? Below is the link- screenshot of my work on proteus. This is not yet finished and still doing trial and error. Thanks.